K33 BLG 30% CO2 + RH/T Data Logging Sensor | CO2Meter.com
**IMPORTANT: With an abundance of caution for our employees health and safety the CO2Meter offices will be closed Thursday, September 29 and Friday, September 30 because of the pending impact of Hurricane Ian. Orders placed online will be fulfilled once our offices reopen.**

K33 BLG 30% CO2 + RH/T Data Logging Sensor

K33 BLG 30% CO2 + RH/T Data Logging Sensor
Regular price $349.00

POs or wholesale quantity discounts click here

The K33 BLG (bio-logger) sensor is designed to measure up to 30% carbon dioxide, temperature and % relative humidity, then record them to internal memory. This makes it an excellent CO2 sensor for enclosed applications like bio-incubators or for portable CO2 meters where sampling of high levels of CO2 is required.

*Please note the sensor diagram referenced in the manual displays an opposite drawing of the actual sensor module itself*


  • Measures 30% CO2, Temperature, %RH
  • Built-in Memory for Data Logging
  • Multiple Industry standard I/O options


CM-0025 K33 BLG 30% CO2 Sensor Development Kit - Easy to use, simply plug the sensor module into your PC via USB. The Devkit includes a K33 BLG sensor with pre-soldered connectors that provide power and connectivity. Use it for evaluation, rapid application development or for experiments. Uses our free GasLab® software to measure and graph carbon dioxide, to configure the sensor or for data logging.

SE-0027 K33 BLG 30% CO2 Sensor Only - for integration into high-volume OEM products. Contact us directly for wholesale pricing on large quantities of this sensor


  • CO2 Measurement: non-dispersive infrared (NDIR)
  • Measurement Method: Sampling
  • Measurement Range: 0-300,000 ppm (0–30%)
  • Rate of Measurement: 0.5 Hz (once every 2 seconds)
  • CO2 Accuracy: ± 0.2% vol CO2 ± 3% of measured value
  • Temperature Range: -40 to 60C
  • Temperature Accuracy: ± 0.4C at 25C
  • Relative Humidity Range: 0-100% RH non condensing
  • Relative Humidity Accuracy: ± 3% RH
  • Data logging: 30 seconds to 18 hours sample interval
  • Support for real-time measurement with software
  • Memory: 5,400 log entries maximum, includes time stamp, co2, temp, RH. 1 additional analog input to the log available
  • Available Outputs: analog
  • Communication Options: UART or I2C
  • Sensor Life Expectancy: > 15 years
  • Maintenance Interval: no maintenance required
  • Self-Diagnostics: complete function check of the sensor module

Electrical / Mechanical

  • Power Input: 5.5-12 VDC max rating, stabilized to within 10%
  • Max Current: 250 mA
  • Dimensions: 2.0 × 2.25 × 0.88 inches (0.62 inches w/o tube adapter)


  • 90 days - See CO2Meter Terms and Conditions. 

Free Easy-to-use GasLab™ Software

This device uses GasLab® software for setup, calibration, data logging, and real-time data analysis. GasLab® makes it easy to export data into a .CSV file that can be imported into any industry-standard software or spreadsheet. GasLab® runs on Windows XP or higher, and free to use with our products.

Download Latest Software Here


  • Data Sheets

  • Manuals

  • Technical Documents

  • Videos

  • Additional Resources

  • Case Studies

Customer Reviews

Based on 2 reviews
Philippe Lacombe


Aadu Simm
All good!

All good! I look forward to doing business again!

"Easy to install, easy to set up, and easy calibration - just what I was looking for."

- Phillip Farrar
Water Plant Superintendent

Read More Reviews...